Date: Fri, 6 Jan 2012 13:07:20 +0100 From: Matthias Apitz <guru@unixarea.de> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-multimedia@freebsd.org Subject: Re: webcamd/cuse4bsd && Skype Message-ID: <20120106120720.GA5779@tinyCurrent> In-Reply-To: <201201051900.01903.hselasky@c2i.net> References: <20120101164408.GA2389@tinyCurrent> <201201051653.15808.hselasky@c2i.net> <20120105175505.GA2167@tinyCurrent> <201201051900.01903.hselasky@c2i.net>
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El día Thursday, January 05, 2012 a las 07:00:01PM +0100, Hans Petter Selasky escribió:
> > OK concerning HAL, but the main question is why the V4L IOCTL are not
> > translated into V4L2? where should I look? thanks
>
> They are, but probably the structure size is wrong.
>
> --HPS
Hello Hans,
I have below a gdb session of the 1st failing IOCTL after the open; does
not look like a problem of the structure size; the error is returned
from the call
ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
let me know if you need more details of the gdb session; thanks
matthias
# gdb work/webcamd-3.2.0.1/webcamd
...
(gdb) br v4b_ioctl
Breakpoint 1 at 0x82f2c96: file webcamd.c, line 265.
(gdb) r
Starting program: /usr/ports/multimedia/webcamd/work/webcamd-3.2.0.1/webcamd
(now Skype in another session)
mydebug: v4b_open fflags: 00000003
mydebug: linux_open gives: handle=28c08600
[Switching to Thread 28805180 (LWP 100240)]
Breakpoint 1, v4b_ioctl (cdev=0x2882c0c0, fflags=7, cmd=1074034177, peer_data=0x10000)
at webcamd.c:265
265 printf("mydebug: v4b_ioctl: cmd=0x%08x\n", cmd);
(gdb) n
mydebug: v4b_ioctl: cmd=0x40047601
266 handle = cuse_dev_get_per_file_handle(cdev);
(gdb) n
267 printf("mydebug: v4b_ioctl: handle=%08x cmd=0x%08x\n", handle, cmd);
(gdb) n
mydebug: v4b_ioctl: handle=28c08600 cmd=0x40047601
270 if (cmd == FIONBIO || cmd == FIOASYNC)
(gdb) n
274 error = linux_ioctl(handle, fflags & CUSE_FFLAG_NONBLOCK,
(gdb) s
linux_ioctl (handle=0x28c08600, fflags=4, cmd=1074034177, arg=0x10000)
at kernel/linux_file.c:114
114 if (handle == NULL)
(gdb) n
117 linux_fix_f_flags(&handle->fixed_file, fflags);
(gdb) n
119 if (handle->fixed_file.f_op->unlocked_ioctl != NULL)
(gdb) n
120 return (handle->fixed_file.f_op->unlocked_ioctl(&handle->fixed_file,
(gdb) s
v4l2_ioctl (filp=0x28c08608, cmd=1074034177, arg=65536)
at media_tree/drivers/media/video/v4l2-dev.c:333
333 struct video_device *vdev = video_devdata(filp);
(gdb) n
334 int ret = -ENODEV;
(gdb) n
336 if (vdev->fops->unlocked_ioctl) {
(gdb) n
337 if (vdev->lock && mutex_lock_interruptible(vdev->lock))
(gdb) n
339 if (video_is_registered(vdev))
(gdb) n
340 ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
(gdb) n
341 if (vdev->lock)
(gdb) p ret
$1 = -22
(gdb) n
379 if (ret == 0 && cmd == VIDIOC_ENUMINPUT) {
(gdb) n
397 return ret;
(gdb) n
398 }
(gdb) n
linux_ioctl (handle=0x28c08600, fflags=4, cmd=1074034177, arg=0x10000)
at kernel/linux_file.c:127
127 }
(gdb) n
v4b_ioctl (cdev=0x2882c0c0, fflags=7, cmd=1074034177, peer_data=0x10000)
at webcamd.c:276
276 printf("mydebug: linux_ioctl returns: error=%08x\n", error);
(gdb) n
mydebug: linux_ioctl returns: error=ffffffea
--
Matthias Apitz
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
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